Add dagger to bazel-common.

[copybara-service]

Add dagger to bazel-common.

[ronshapiro]

This is an old version of dagger. And dagger is already built with Bazel, does it need this?

[cpovirk]

Thanks, I should have noticed the older version and asked @mollyibot if that was chosen to match a version that was already used by J2CL(?).

As for Dagger's use of Bazel: Are you suggesting that we follow the instructions at https://github.com/google/dagger#bazel instead of setting it up this way? We had discussed that briefly, and I wasn't sure whether we'd still benefit from the #bazel approach when we're going to be declaring //third_party/java/dagger targets manually in bazel-common either way. It does seem that our current approach might affect the versions that Bazel chooses for other dependencies, ones that Dagger uses only from its annotation processor, and maybe that doesn't make a lot of sense. But maybe it will also be more amenable to automated upgrades (which Dependabot doesn't do for Bazel, admittedly, though we could set up Renovatebot), or maybe either style is equally easy to update?